Diseases Caused By Infectious Agents?

Infectious diseases can be caused by:

  • Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.
  • Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.
  • Fungi.
  • Parasites.

What are the agents of infectious diseases?

There are five major types of infectious agents: bacteria, viruses, fungi, protozoa, and helminths. In addition, a new class of infectious agents, the prions, has recently been recognized. A brief review of the general characteristics of each of these agents and examples of some diseases they cause follows.

What are the 4 types of infectious diseases?

This article will focus on the most common and deadly types of infection: bacterial, viral, fungal, and prion.

What are the 5 types of infectious agents?

Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms. Some common pathogens in each group are listed in the column on the right. Infectious agents can grow in various body compartments, as shown schematically in Fig.

What are examples of contagious diseases?

Common examples of contagious viral diseases include the flu, the common cold, HIV, and herpes. Other types of viral diseases spread through other means, such as the bite of an infected insect.

What are the 7 pathogens?

Infectious diseases are caused by pathogens, which include bacteria, fungi, protozoa, worms, viruses, and even infectious proteins called prions.

What are the 6 infectious agents?

There are five major types of infectious agents: bacteria, viruses, fungi, protozoa, and helminths.

What are the 5 most common infectious diseases?

The 5 Most Common Infectious Diseases

  1. Hepatitis B. According to current statistics, hepatitis B is the most common infectious disease in the world, affecting some 2 billion people — that’s more than one-quarter of the world’s population.
  2. Malaria.
  3. Hepatitis C.
  4. Dengue.
  5. Tuberculosis.
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What are the 10 most common diseases?

  • Unintentional injuries.
  • Chronic lower respiratory disease.
  • Stroke and cerebrovascular diseases.
  • Alzheimer’s disease. Deaths in 2017: 121,404.
  • Diabetes. Deaths in 2017: 83,564.
  • Influenza and pneumonia. Deaths in 2017: 55,672.
  • Kidney disease. Deaths in 2017: 50,633.
  • Suicide. Deaths in 2017: 47,173.

What are the 6 types of pathogens?

Big 6 Pathogens. The FDA lists over 40 types of bacteria, viruses, parasites, and fungi that contaminate foods and cause illness, but they have singled out 6 that are the most contagious and cause the most severe symptoms. They are E coli, Hepatitis A, Nontyphoidal Salmonella, Norovirus, Shigella, Salmonella Typhi.

What are the major types of infectious agents?

Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms. Some common pathogens in each group are listed in the column on the right. Infectious agents can grow in various body compartments, as shown schematically in Fig.

What are the 5 modes of transmission?

There are five main routes of disease transmission: aerosol, direct contact, fomite, oral and vector, Bickett-Weddle explained at the 2010 Western Veterinary Conference. Diseases can be spread to humans (zoonotic) by those same five routes.

What is the smallest infectious agent?

  1. Prions and Virods. The smallest known infectious agents, prions are composed of a single protein and viroids are a simple circle of ribonucleic acid (RNA).
  2. Viruses. Viruses are simple particles – as few as two genes inside protein shells – that must infect a host cell to grow and reproduce.
  3. Bacteria.
  4. Fungi.
  5. Parasites.

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